Dado-plane.



H. SMILEY.

DADO PLANE.

-APPL10ATI0N FILED ooT.12,191o.

1,01 1,648. Patented Dec. 12, 1911..

j( Henry Smiley;

'UNITED STATES PATENT OFFICE.

HENRY SMILEY, 0F BOSTON, MASSACHUSETTS.

DADO-PLANE.

Original application led November 30, 1909, Serial No. 530,706.

Speciication of Letters Patent.

Patented Dec. 12, 1911.

Divided and this application led October Serial No. 586,718.

To all whom 'it may concern.' Be it known that I, HENRY SMILEr, acitizen of the United States, and a resident of Boston, in the county ofSuffolk and Com` planes known as dado planes, and my invention consistsin the improved means for cutting grooves and clampingl and adjustingthe blade and cutter thereof.

of this specification, Figure 1 is a Iperspective view of a dado planeembodying my improvements. Fig. 2 is a face view of the metallic sectionof the plane, with the wooden section removed, showing my im- Fig. 3 isan under` Fig. 4 is a perspective4 view of a portion of the metallicsection of Fig. 5 is a perspective view of provements complete. view ofthe blade.

the plane. the blade-clamping block. Fig. 6 is a face view of one of theU-shaped fastening devices. Fig. 7 is a sectional View on a verticaltransverse plane, of the clamping block and associated parts of theplane. Fig. 8 is a detail view ofthe thumb-screw for actuating theclamping-block. Fig. 9 is a perspective view of the adjusting block.

Looking first at Fig. 1, the metallic section of the plane is designatedby the reference numeral 1, and the wooden section by the numeral 2; thelatter section being formed with a handle or grip 3. The blade 4 issupported by the inclined seat 5 and the tongue 6, and also by theadjusting block 7. The latter is slidable upon the way 9 which isparallel with said seat, and is proportioned to bring its upper surfacein the same plane with said seat. Above the blade 4 is the clampingblock 10, shown also in Fig. 5, the elongated face 11 of which restsagainst the upper surface of said blade, while its face 12 is preferablyexactly vertical. This vertical face contacts with the stop 13 whichforms a part of the clearing mouth 14, and coacts with said block topress it against said blade when the block is forced downward by thethumb screw 15. This stop 13 is also illustrated in Fig. 4, as well asin Fig. 2. By having the adjusting block 7 proportioned and supported asabove set forth, the blade is tightly gripped for the larger part of itslength and not only securely held by the clamping block, but the latteris prevented from bending the blade and so causing it to chatter whilein use. The thumb screw 15 is loosely mounted, in the two bosses 16 and17 and is kept from longitudinal displacement therein by the U- shapedfastening 'device 18 located between said bosses and engaging theannular groove 19 in the scr-ew. See Figs. 6, 7 and 8. The

` lower end of said screw being tapped into Referring to the drawingsforming part the clamping block 10, and the internally threaded hole 2Otherein being' sufliciently deep, the turning of said screw in onedirection will elevate said block far enough to permit the removal ofthe blade 4 whenever desired. By thus having the clamping block descendat a constant angle upon the blade so that it preserves a perfectlyflush contact therewith, the corner or edge 21 of said block is alwayssharply down upon the same so that there can be no crevice thereat forcatching shavings and splinters. Instead, the vertical face of the`clamping block is always clear and clean to act against the shavings asthey rise from the cutting-edge of the blade, and so to coil them overupon themselves and into coaction with the discharge-mouth 14 of theplane. Immediately below the point 23 and terminating at the undersurface or vbottom of the plane, is what is usually termed the throat ofthe discharge mouth. I have discovered that by giving a twist to thisthroat,jthat is, by forming said surface by a horizonal line slowlyrising and at the same time revolving through a limited arc upon avertical aXis at the middle of said throat, the shavings rising from thecutting edge will more perfectly and with certainty clear themselvesfrom the plane and be laterally discharged through the mouth. This ismost clearly indicated in Fig. 2 wherethe dotted line represents thelowermost part of the opposite edge of said throat where it descends ouof sight behind the edge nearer the spectator.

As shown in Fig. 3, the blade 4 is formed with an offset shoulder 24designed to enter the throat 25 (Figs. 1 and 4), and so present thecutting edge of the'blade flush with the corresponding lateral surfaceof the plane. The opposite side of the blade is alsocut away slightly,as at 26, Fig. 3, in order that the blade may be of the same width asthe tongue 6. p

Fig. 7 shows the wooden section 2 fitted against the bosses 16, 17 andso serving to keep the member 18 in place. At the back of the blade 4are. one or more grooves 27 adapted to be entered by the rib 29 of theblock 7, and thereby to hold the blade in engagement with said block andso permit the blade to be adjusted. Said block is adjusted, and theblade therewith, by means of the screw 30 threaded therein; the screwbeing held against longitudinal play by a U-shaped fastening device 18located between bosses 16, 17 and engaging a groove 19 in the screw 30,in the same way as the screw 15 already described. The inner end of thescrew 30 turns in a suitable recess in the seat 5, as indicated bydotted lines in Fig. 2, so that said screw is given a double,ysuspension by thus having two centers 1nv which to revolve, so that theblock 7 can travel the entire length of the screw. In

adjusting the blade 4, the thumb screw 15 is firstslightly unloosenedenough to per? mit movement of the blade, and then the screw 30 turneduntil the cutting edge of the blade is brought exactly to the pointdesired; after which the clamping block is pressed firmly down by itsscrew l5 to bind the blade immovably in place. To remove the blade, asfor sharpening, the thumbscrew 15 is turned until the clamping block iselevated far enough to permit the blade to be disengaged from the rib 29and then withdrawn from the plane. At a suitable distance in advance ofthe blade 4 is the cutter comprising a plurality of cutterpoints at thelower end 0f a bar 31, said bar and points 32 being shown in Fig. 2.This cutter bar is vertically slidable between the ways 33, shown inFigs. 2 and 4, and is adjusted by a screw 34 like the screw 15 alreadydescribed. I do not claim this cutter in this application, inasmuch asit forms the subject matter of my companion application Serial No'.530,706.

What I claim as my invention and for which I desire Letters Patent is asfollows, to wit 1. The combination with a dado plane and a bladetherefor supported at an angle, of a clamping block having a verticalface and an oblique face meeting each other at a sharp angle, saidoblique face fitting against the surface of said blade, and means forpressing said block vertically downward against said blade, said planebeing formed with a mouth having an arched roof terminating in a stopagainst which rests said vertical face of the block, and said verticalface being tangential with the curve of said arched roof.

2. A dado plane comprising a body, a blade supported thereby, andclamping and adjusting means for said blade, said blade having alaterally offset lower portion, and said body having a slot through itsside slidably receiving the offset portion of said blade, said partsbeing so disposed that when the cutting edge of the blade is at itsproper operative point said offset portion is located in said slot andis held in place thereby when the clamping means is unloosened from theblade.

8. A dado plane comprising a body and a blade carried thereby, said bodybeing formed .with a mouth having an arched roof above terminating in astop, said arched roof curving downward and terminating in a twist inthe throat of said mouth near the cutting edge of said blade, said twisteX- tending upward from the bottom of the plane and being and merginginsensibly into said downward curve.

In testimony that I claim the foregoing invention, I have hereunto setmy hand this 8th day of October, 1910.

I-IENRY SMILEY. Witnesses A. B. UPHAM, H. L. WHITTLESEY.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

"Washington, D. C.

